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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Tue, 11 Dec 2012 15:20:09 -0700
Subject: Re: ANNOUNCE: Thesaurus - a recursive dictionary subclass using attributes
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On Tue, Dec 11, 2012 at 2:53 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> and then I ran the examples, and the output was unchanged.  As Steven
> pointed out, I don't see how that first branch could succeed anyway,
> since self.data is never defined.

It occurs to me that the UserDict class does have a data attribute.
Perhaps there was another version of Thesaurus that inherited from
UserDict instead of dict, and so the access to .data is a holdover
from legacy code?